X is an integer that's greater than or equal to 4 and less than or equal to 9

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?